Hopefully the userland can figure out a value from the introspection. If the knob exposes a range with two examples, a powersave value and a balanced value, the userland can pick the powersave value for powersave and more energy-efficient modes, and the balanced value for balanced and more performance-oriented modes. Generally: pick the example nearest the desired mode.
If you have a more advanced user willing to figure things out, you can let them view the range, pick values and submit a patch, but that doesn't need to be the default user experience.
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